IXDebugTouchEvents()

IXDebugTouchEvents.m

// IXDebugTouchEvents() will flash the view that receives a touch event


BOOL IXSwizzleMethod(Class cls, SEL selA, SEL selB)
{
    Method methodA = class_getInstanceMethod(cls, selA);
    if (!methodA) return NO;
	
    Method methodB = class_getInstanceMethod(cls, selB);
    if (!methodB) return NO;
	
    class_addMethod(cls, selA, class_getMethodImplementation(cls, selA), method_getTypeEncoding(methodA));
    class_addMethod(cls, selB, class_getMethodImplementation(cls, selB), method_getTypeEncoding(methodB));
	
    method_exchangeImplementations(class_getInstanceMethod(cls, selA), class_getInstanceMethod(cls, selB));

    return YES;
}


void IXDebugTouchEvents()
{
    static BOOL didSwizzle = NO;
    if (!didSwizzle) {
        IXSwizzleMethod([UIApplication class], @selector(sendEvent:), @selector(ix_sendEvent:));
        didSwizzle = YES;
    }
}


@implementation UIApplication (IXDebug)

- (void) ix_sendEvent_highlightTouches:(NSArray *)touches
{
    static NSMutableDictionary *sViewToWindowMap = nil;

    if (!sViewToWindowMap) {
        sViewToWindowMap = [[NSMutableDictionary alloc] init];
    }

    for (UITouch *touch in touches) {
        UIView *view = [touch view];

        if (view) {
            NSValue *viewValue = [NSValue valueWithPointer:(__bridge void *)view];
            CGRect frame = [view convertRect:[view bounds] toView:nil];
        
            UIWindow *window = [sViewToWindowMap objectForKey:viewValue];
        
            if (!window) {
                window = [[UIWindow alloc] initWithFrame:frame];
                [window setUserInteractionEnabled:NO];
                [window setWindowLevel:UIWindowLevelStatusBar + 1 + [sViewToWindowMap count]];
                [window setHidden:NO];
                [window setExclusiveTouch:NO];

                [sViewToWindowMap setObject:window forKey:viewValue];

                [window setBackgroundColor:[UIColor colorWithRed:0 green:1 blue:0 alpha:0.33]];
            }
            
            [window setFrame:frame];
            [window setAlpha:1.0];

            [UIView animateWithDuration:0.5 animations:^{
                [window setAlpha:0];

            } completion:^(BOOL finished) {
                if (finished) {
                    [window removeFromSuperview];
                    [sViewToWindowMap removeObjectForKey:viewValue];
                }
            }];
        }

        NSLog(@"%@", [touch view]);
    }
}


- (void) ix_sendEvent:(UIEvent *)event
{
    [self ix_sendEvent:event];
    [self performSelector:@selector(ix_sendEvent_highlightTouches:) withObject:[event allTouches] afterDelay:0];
}

@end